New motor back,first dyno run.

[88stangmangt]

Ok so as we stand now im maxing out the VAM at 3krpms...causing it to run lean....we were attempting to program a SCT chip. I didnt get any honest runs in becuase we had to keep shuting it down at 3k...but at that time(3k) it was seeing 14psi with a massive torque jump. so im in the process of trying to get my hands on a 90mm lightning MAF which I'll set up and run it as a draw-thru. Im also going to upgrade to 52lbs injectors and go ahead and port the upper and lower while its down...therefore i can have it tuned one final time. the numbers were dismal but im sure you guys will ask but it made 135hp/210lbs.Torque was skyrocketing so there is still a ton left in her. what do you guys think about the MAF/Injectors.?

 

[bhuff30]

wow, your post leaves a LOT more questions than answers. If you are going that lean at 3k when boost comes on, then it seems like you must be running the stock NA injectors... 14 lbs per hour. haha
You are running a VAM now? what injectors? The stock 35s (for TC and SVO) should be good for at least 260 at the crank, and that's at the stock fuel pressure. People have ecked out 300rwhp from them before. For the stock 30lbs, they are probably good for at least 240.
Also, how are you going from VAM to MAF? Your WMS stand alone supports that?

 

[351wcoupe]

I'm wondering if the 52's are needed.

How lean did it actually go?
Can you post the graph?
What would happen if you crank the hell out of the fuel pressure and tune it to lean it out a little for normal driving.

 

[88stangmangt]

at 3k we were seeing 5volts from the VAM and by then it was guessing at the A/F ratio sending it into the 15:1 at WOT....so we couldnt go any higher the injectors wernt pegged just the air meter....so I have seen people use a lightning air meter on a chip computer. i mean it can be to hard you have a 12v hott,ground 5v referance and im not sire about the 4th wire....he told me to also upgrade the stock 35lbs injectors because he said those would be maxed at about 260-275hp. we were running at 40psi F/P without vaccum....but i think it is the pulse that is what is most important meaning how long they stay open and how much versus the f/p.

 

[65ShelbyClone]

12v hott,ground 5v referance and im not sire about the 4th wire....

12v switched, 5v ref, ground, and signal. The physical conversion is not the hard part; getting the correct fuel tables and transfer functions in th ECU is. Ideally you have someone with a mean flowbench than can check the Vout of the meter at several intervals to see the relation between flow and voltage. More data points are needed if the relation is not linear. Another option is to setup the VAM as a blow-through. You need a J3 tuner either way.

 

[Stinger]

If the tuner knows what they are doing, they can still command enough fuel to keep the engine safe even after the vam is maxed out. Mine maxes out at about the same RPM but I can keep the a/f safe with stock fuel pressure and 42lb injectors...or stock injectors and 50psi fuel pressure.

As stated, going MAF requires alot more than just wiring in the sensor.

 

[88stangmangt]

well i bought a lightning MAF and if the tuner is as good as he says...he should'nt have a problem tuning the meter...he told me he could do anything with the meter if i got one that didnt max at 3k. plus the VAM is tiny anyway... so i guess im gonna pick up a set of 52lb injectors and take her back to the dyno.

 

[65ShelbyClone]

Have you been using a small or large VAM? If either size was actually pegged and not faulty.....that is a helluva lot of air to be moving at just 3k.

 

[88stangmangt]

large vam 15psi through a t4 compressor...at3k with a 4.5v already.

 

[351wcoupe]

You are running the VAM in the stock location?

I've seen pulls of 300hp with surprisingly stock set-up.

I know a guy that went 7.19 in the 1/8th with stock injectors, stock/untuned LA3, and stock fuel pressure.

 

[65ShelbyClone]

I've seen pulls of 300hp with surprisingly stock set-up.

That is what I was thinking too. To actually max out a large VAM at just 3000rpm would mean this is a 600hp engine. It has some really nice parts and mods, but I just don't see 600hp there. I suspect that perhaps the VAM wiper assembly has a fault and pegs out at only half flow, unless I'm really off base on total engine airflow characteristics.

Have you tried testing the VAM manually with a VOM to see if it has a screwy resistance curve?

 

[Stinger]

Actually, it will max at 3k on a mildly modded 2.3...

 

[88stangmangt]

yup....so were trying a lightning air meter and a set of 52lb injectors...because we figured they would be the next to be maxed.